Stuck in restart loop after installing updates for ubuntu

I just finished installing several updates for ubuntu, going from 9.1 to 10.04. everything installed and my computer restarted but all i get is a blue screen that flashes between blue and black, like its just restarting over and over, any ideas whats happening and how i can correct it? I'm very new to this os. please help

Had a problem like that some time ago so I just uninstalled and downloaded
the new program. I'm using 11.04 now as well as micros Vista. I like the
new Ubuntu 11.04 it's the best yet. Try it. Try installing it using wubi
it's a easy install.

Yes but all you really need to do is download wubi. It's an installer for
ubuntu. Just Google wubi and download that way you can use that as well as
a Microsoft os. I'm using both Vista and Ubuntu. All I do is click one or the
other whenever I boot. Make sure you get 11.04. It really is better
I really think it's getting close to where it should be Microsoft it too
costly and too buggie.

Try system recovery. I haven't had that happen to so I really can't be of
much help other then trying recover by going back by way of safe mode.
Shut down and before (if) it reboots click on F8 a few times then go back a
day. That's about all I can say.

My own advice is to find a friend with a working computer, download the
version of Ubuntu marked stable (either 10.4 or 10.04, I don't remember),
copy the downloaded file to a blank DVD, and then start the computer with
the DVD in the read slot.

The HP I was using had a nasty trick built into the boot-loader which had
the computer looking at the HP recovery area before the DVD reader. You can
get around this by changing the order
which the boot-loader reads the boot devices. You will probably not need to
use this, but I'm just warning so you won't spend half a day chasing down a
non-problem. If you try to load
Ubuntu and it keeps coming up Windows, you know what to do.

Once you get the computer to recognize, just follow the directions. When it
asks if you want a dual-boot system, check "no" unless you have a lost of
hard disk and a real need to play computer games.

You will probably have to do some stuff like add Adobe flash, or the
pdf-importer, etc. Just come back to the forum and use the easiest answers
for how to do these.

There's a few ways to tackle this. None are promised to work but you should be able to backup your data with ease from the LiveCD before doing a clean install.. Easy:

First: Get yourself an Ubnutu GNU/Linux LiveCD, boot up to it, then plugin a USB thumb drive or use the network to backup any pertinent data that you want to keep.

After you have safe backup then one of these should work (even if it means reinstalling Ubuntu GNU/Linux):

1.) Try to figure out what the problem is with the current install - Start by getting into the grub menu on startup, then type "e" to edit the startup command - use your arrows and delete keys to remove "quiet" and "splash", then hit ctrl+x to boot with these options removed. This should force something to show on the screen during boot.. With any luck you can capture an error message or at least some information that indicates where in the boot process the system is failing. Take note and paste back here.

2.) Get the newest version of Ubuntu GNU/Linux, which is 11.04. Boot to the LiveCD and install.. On install, choose "Upgrade this System".. Let it finish - see if it works.

3.) (this would be my choice) Get the newest version of Ubuntu GNU/Linux, make a "clean" install, but this time use the manual option and set yourself up 3 partitions: 1.)swap type: primary, 2.) "/" (root partition), ext4, make it about 15GB or so, and 3.) "/home" (home directory), use the rest of the disk space for this). Setting up your /home partition as separate will make future clean installs both easy and very safe in terms of being able to reload just the system without erasing your personal data. When using this option, be sure to always use the manual partition setup if doing clean installs in the future. When doing your clean installs, you'll need to recreate whatever users for the system you have setup, then use the Terminal to chown <appropriate-username:groupname(e.g., users)> /home/<appropriate-username-directory>.

With GNU/Linux, making a clean install is easy because all the software to reinstall is free! Also, no activation is required after clean install... like some of those other operating systems. LOL

I've been using Linux exclusively) for about 5 years with nothing but the
built-in foxfire firewall. (For about 4 years before that, I used a dual
boot system solely for gaming.) The computer I use now is about 6 years
old and it is as fast today as it was when I started it up
(well, almost). I only upgrade to new, stable releases and update about
once a week.

During the time I'm talking about, my wife has gone through 2 computers,
both using windows. She ran every firewall and virus scanner available, and
still saw a marked decrease in performance almost from the start. In both
cases, the computer finally became so slow that she wanted to re-install
Windows. This didn't help since the problem was a badly overloaded registry
so she bought a new machine.

Of course, the same thing happened again. But this last time,l I suggested
Linux to her. She was resistant, but did not want to buy a new machine.
She was afraid she was going to "lose AOL". (For her AOL and Windows are
synonyms). I loaded a dual-boot system so that she could practice using
Linux while she decided. Windows had eaten up almost all of her hard drive,
but there was enough left for a Linux installation, complete with foxfire.
This slowed down Linux a bit and resulted in a few crashes, but she was
still doing a 'lot' better than with Windows. After about two weeks, she was
telling me to "get that that damned AOL off my computer". She is now
completely happy with her computer and keeps wondering why Windows has any
customers left.